netfilter: nft_set_rbtree: fix overlap expiration walk
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.5epss 0.2%
exploitation probability
0.2%top 96% of all CVEs
observed exploitation
nono source reports it
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nft_set_rbtree: fix overlap expiration walk
The lazy gc on insert that should remove timed-out entries fails to release
the other half of the interval, if any.
Can be reproduced with tests/shell/testcases/sets/0044interval_overlap_0
in nftables.git and kmemleak enabled kernel.
Second bug is the use of rbe_prev vs. prev pointer.
If rbe_prev() returns NULL after at least one iteration, rbe_prev points
to element that is not an end interval, hence it should not be removed.
Lastly, check the genmask of the end interval if this is active in the
current generation.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/50cbb9d195c197af671869c8cadce3bd483735a0https://git.kernel.org/stable/c/8284a79136c384059e85e278da2210b809730287https://git.kernel.org/stable/c/893cb3c3513cf661a0ff45fe0cfa83fe27131f76https://git.kernel.org/stable/c/89a4d1a89751a0fbd520e64091873e19cc0979e8https://git.kernel.org/stable/c/acaee227cf79c45a5d2d49c3e9a66333a462802chttps://git.kernel.org/stable/c/cd66733932399475fe933cb3ec03e687ed401462https://git.kernel.org/stable/c/f718863aca469a109895cb855e6b81fff4827d71